Effect of Opalescence® bleaching gels on the elution of bulk-fill composite components. Issue 2 (February 2016)

• Record Type: Journal Article
• Authors: Schuster, Lena; Reichl, Franz-Xaver; Rothmund, Lena; He, Xiuli; Yang, Yang; Van Landuyt, Kirsten L.; Kehe, Kai; Polydorou, Olga; Hickel, Reinhard; Högg, Christof
• Is Part Of: Dental materials. Volume 32:Issue 2(2016)
• Page Start: 127
• Page End: 135
• Publication Date: 2016-02
• Subjects: Bleaching -- Peroxide -- Bulk-fill composite -- Elution -- Comonomer -- Polymer network; Dentistry -- Periodicals; Dental materials -- Periodicals; 617.695
• DOI: 10.1016/j.dental.2015.11.033
• Languages: English
• ISSNs: 0109-5641

Abstract

Abstract: Objectives: Bleaching treatments can affect release of components from conventional composites. In this continuing study the influence of two different bleaching gels on the elution of bulk-fill composite components was investigated. Methods: The composites Tetric EvoCeram ® Bulk Fill, QuiXFil™ and X-tra fil were treated with the bleaching gels Opalescence PF 15% (PF 15%) for 5 h and PF 35% (PF 35%) for 30 min and then stored in methanol and water for 24 h and 7d. The eluates were analyzed by gas chromatography/mass spectrometry (GC/MS). Unbleached specimens were used as control group. Results: A total of 7 different elutable substances have been identified from the investigated composites after bleaching-treatment. Three of them were methacrylates: 2-hydroxyethyl methacrylate (HEMA), triethylene glycol dimethacrylate (TEGDMA) and trimethylolpropane trimethacrylate (TMPTMA). Compared to the unbleached controls an increase in elution after PF 15%-treatment of following compounds was found: HEMA (Tetric EvoCeram ® Bulk Fill), TEGDMA (QuiXFil™, X-tra fil) and 4-N, N-dimethylaminobenzoic acid butyl ethoxy ester (DMABEE) (Tetric EvoCeram ® Bulk Fill, QuiXFil™, X-tra fil). Following compounds showed a reduction in elution after PF 35%-treatment compared to controls: TEGDMA (QuiXFil™) and DMABEE (Tetric EvoCeram ® Bulk Fill). The highest concentration of HEMA was 0.22 mmol/l (Tetric EvoCeram ® Bulk Fill, methanol, 7d, PF 15%), the highest concentration of TEGDMA was 0.3 mmol/l (X-tra fil, water, 7d, PF 15%) and the highest concentration of DMABEE was 0.05 mmol/l (QuiXFil™, water, 7d, PF 35%). Significance: PF 15% and PF 35% can lead to reduced and/or increased elution of some bulk-fill components, compared to unbleached bulk-fill composites.